一质点在恒力f的作用下由o点运动到a点的轨迹如图所示在a点时的速度方�与x轴平行则恒力f的方�可能沿图示中的 A.f1的方�b.f2 Template




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tomski一质点在恒力f的作用下由o点运动到a点的轨迹如图所示在a点时的速度方�与x轴平行则恒力f的方�可能沿图示中的 a.f1的方�b.f2 coloring